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Wed, 17 Jun 2026 08:04:05 -0700 (PDT) From: Jun Yan To: Dmitry Torokhov , Rob Herring , Krzysztof Kozlowski , Conor Dooley Cc: Jun Yan , linux-input@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v4 06/10] Input: cap11xx - add reset gpio support Date: Wed, 17 Jun 2026 23:02:45 +0800 Message-ID: <20260617150318.753148-7-jerrysteve1101@gmail.com> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260617150318.753148-1-jerrysteve1101@gmail.com> References: <20260617150318.753148-1-jerrysteve1101@gmail.com> Precedence: bulk X-Mailing-List: linux-input@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Some CAP11xx devices (CAP1126/CAP1188) have a dedicated RESET pin. Add hardware reset operation to improve device reliability and ensure proper initialization on probe. Signed-off-by: Jun Yan --- drivers/input/keyboard/cap11xx.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/drivers/input/keyboard/cap11xx.c b/drivers/input/keyboard/cap11xx.c index fae26f035186..1db4a9090705 100644 --- a/drivers/input/keyboard/cap11xx.c +++ b/drivers/input/keyboard/cap11xx.c @@ -5,6 +5,7 @@ * (c) 2014 Daniel Mack */ +#include #include #include #include @@ -44,6 +45,9 @@ #define CAP11XX_MANUFACTURER_ID 0x5d +#define CAP11XX_T_RST_FILT_MIN_US 10000 +#define CAP11XX_T_RST_ON_MIN_MS 400 + #ifdef CONFIG_LEDS_CLASS struct cap11xx_led { struct cap11xx_priv *priv; @@ -56,6 +60,7 @@ struct cap11xx_priv { struct regmap *regmap; struct device *dev; struct input_dev *idev; + struct gpio_desc *reset_gpio; const struct cap11xx_hw_model *model; struct cap11xx_led *leds; @@ -459,6 +464,17 @@ static int cap11xx_i2c_probe(struct i2c_client *i2c_client) if (IS_ERR(priv->regmap)) return PTR_ERR(priv->regmap); + priv->reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH); + if (IS_ERR(priv->reset_gpio)) + return dev_err_probe(dev, PTR_ERR(priv->reset_gpio), + "Failed to get 'reset' GPIO\n"); + + if (priv->reset_gpio) { + usleep_range(CAP11XX_T_RST_FILT_MIN_US, CAP11XX_T_RST_FILT_MIN_US * 2); + gpiod_set_value_cansleep(priv->reset_gpio, 0); + msleep(CAP11XX_T_RST_ON_MIN_MS); + } + error = regmap_read(priv->regmap, CAP11XX_REG_PRODUCT_ID, &val); if (error) return dev_err_probe(dev, error, "Failed to read product ID\n"); -- 2.54.0